During the process of oil and gas extraction, drilling operations generate a large amount of wastewater. This wastewater contains emulsified oil, suspended solids, organic matter, and other pollutants. Without effective treatment, it will cause serious pollution to the environment. Therefore, demulsifier for drilling oil field wastewater is an efficient method for wastewater treatment.
Drilling oil field wastewater demulsifier is a chemical reagent specifically used for treating drilling oil field wastewater. Its main function is to disrupt the emulsified state in the wastewater, allowing for the separation of oil and water, thus purifying the wastewater.
I. Characteristics of drilling oil field wastewater
The composition of drilling oil field wastewater is very complex, mainly including the following aspects:
- Oil substances: The wastewater contains a large amount of petroleum substances such as crude oil, diesel, gasoline, etc. These oil substances exist in an emulsified form in the wastewater, making it difficult to separate.
- Suspended solids: The wastewater contains a significant amount of suspended solids such as silt, rock fragments, clay, etc. These suspended solids increase the turbidity and viscosity of the wastewater, affecting the treatment effect.
- Organic matter: The wastewater contains a large amount of organic matter such as phenols, aldehydes, ketones, etc. These organic substances increase the COD and BOD values of the wastewater, affecting the biological treatment effect.
- Salt substances: The wastewater contains a large amount of salt substances such as sodium chloride, calcium chloride, magnesium sulfate, etc. These salt substances increase the electrical conductivity and hardness of the wastewater, affecting the reuse effect.
II. Principles of drilling oil field wastewater demulsifier
The principles of drilling oil field wastewater demulsifier mainly include the following aspects:
- Charge neutralization: Demulsifiers can neutralize the charge on the surface of emulsified oil droplets in the wastewater, reducing the electrostatic repulsion between the oil droplets, thus promoting their aggregation and separation.
- Disruption of emulsification film: Demulsifiers can disrupt the emulsification film on the surface of emulsified oil droplets in the wastewater, exposing the oil droplets and promoting their aggregation and separation.
- Adsorption: Demulsifiers can adsorb onto the surface of emulsified oil droplets in the wastewater, forming a layer of adsorption film, thereby preventing the re-emulsification of the oil droplets.
- Flocculation: Demulsifiers can cause the suspended solids and organic matter in the wastewater to flocculate into larger particles, facilitating subsequent sedimentation and filtration.

III. Applications of drilling oil field wastewater demulsifier
- The application of drilling oil field wastewater demulsifier is widespread, including the following aspects:
- Pretreatment: During the wastewater treatment process, demulsifiers can be used as pretreatment agents to disrupt the emulsified state in the wastewater, allowing for the separation of oil and water, thereby reducing the burden on subsequent treatment processes.
- Deep treatment: During the wastewater treatment process, demulsifiers can be used as deep treatment agents to further remove oil substances and organic matter from the wastewater, thereby improving the treatment effect.
- Reuse treatment: During the wastewater reuse process, demulsifiers can be used to remove oil substances and organic matter from the wastewater, thus improving the reuse effect.
IV. Selection of drilling oil field wastewater demulsifier
When selecting drilling oil field wastewater demulsifier, the following factors need to be considered:
- Properties of the wastewater: Different wastewater has different properties, such as pH, temperature, salinity, oil content, etc. Therefore, the appropriate demulsifier should be selected based on the properties of the wastewater.
- Performance of the demulsifier: Different demulsifiers have different performance characteristics, such as demulsification speed, demulsification effect, flocculation effect, etc. Therefore, the appropriate demulsifier should be selected based on the performance of the demulsifier.
- Requirements of the treatment process: Different treatment processes have different requirements for demulsifiers, such as pretreatment processes, deep treatment processes, reuse treatment processes, etc. Therefore, the appropriate demulsifier should be selected based on the requirements of the treatment process.
- Economic cost: The price of the demulsifier is also a factor to consider when selecting the demulsifier. The appropriate demulsifier should be selected based on economic costs.
In conclusion, drilling oil field wastewater demulsifier is a very important wastewater treatment reagent. It can effectively solve the problem of drilling oil field wastewater treatment and protect the ecological environment.
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